Filter cartridge



FIG. 1 is a top, right, perspective view of a filter cartridge incorporating our new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof with the left side elevational view being a mirror image thereof; and,

FIG. 6 is a front elevational view thereof with the rear elevational view being a mirror image thereof. 

The ornamental design for a filter cartridge, as shown and described. 